package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RegexUtils;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import javax.servlet.http.HttpSession;

import java.util.HashMap;
import java.util.Map;
import java.util.UUID;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;
import static com.hmdp.utils.SystemConstants.USER_NICK_NAME_PREFIX;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Slf4j
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {

    @Resource
    private StringRedisTemplate stringRedisTemplate;

    /**
     * 发送手机验证码
     * @param phone
     * @param session
     * @return
     */
    @Override
    public Result sendCode(String phone, HttpSession session) {
        /**
         * 1.校验手机号
         * 2.符合则生成验证码--------不符合则返回错误信息
         * 3.保存验证码到session
         * 4.发送验证码
         * 5.返回成功信息
         */
        if (RegexUtils.isPhoneInvalid(phone)) {
            //如果不符合，则返回错误信息
            return Result.fail("手机格式错误");
        }
        //3. 符合，    生成验证码
        String code = RandomUtil.randomNumbers(6);
        //验证码存入redis
        stringRedisTemplate.opsForValue().set(LOGIN_CODE_KEY+phone,code,LOGIN_CODE_TTL, TimeUnit.MINUTES);
        log.debug("发送短信验证码成功，验证码{}", code);
        return Result.ok();

    }

    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
       //1.校验手机号
        String phone = loginForm.getPhone();
        if (RegexUtils.isPhoneInvalid(phone)) {
            //手机号无效
            return Result.fail("手机号无效");
        }
        // 2. 从redis获取验证码
        String cachecode = stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY + phone);
        String code = loginForm.getCode();
        if (cachecode == null || !cachecode.equals(code)){
            //验证码不正确
            return Result.fail("验证码无效");
        }
        //一致,查询用户是否存在
        User user = query().eq("phone", phone).one();

        //3.判断用户是否存在
        if (user == null){
            //不存在，则创建一个新用户
            user = createUserWithPhone(phone);
        }

        //保存用户信息到redis
        //随机生成token，作为登录令牌
        String token = UUID.randomUUID().toString();
        //将User对象转为HashMap存储
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        Map<String, Object> userMap = BeanUtil.beanToMap(userDTO,new HashMap<>(), CopyOptions.create()
            .setIgnoreNullValue(true)
            .setFieldValueEditor((fieldName,fieldValue)-> fieldValue.toString()));
        //4.保存用户信息到redis
        String tokenKey = LOGIN_USER_KEY + token;
        //login:token:
        stringRedisTemplate.opsForHash().putAll(tokenKey,userMap);
        //设置token有效期
        stringRedisTemplate.expire(tokenKey,LOGIN_CODE_TTL,TimeUnit.MINUTES);
        //返回token
        return Result.ok(token);
    }

    private User createUserWithPhone(String phone) {
        User user = new User();
        user.setPhone(phone);
        user.setNickName(USER_NICK_NAME_PREFIX+RandomUtil.randomString(10));
        save(user);
        return user;
    }
}
